Abstract
The interaction of powdered niobium oxide with molten potassium and barium nitrate salts containing KOH was studied. It was shown that KNbO3 can be obtained with the use of binary mixtures of the KOH-KNO3 system. The BaNb2O6 compound can be synthesized in melts of the KNO3-Ba(NO3)2 system. The treatment of Nb2O5 with melts of the system KNO3-Ba(NO3)2-KOH with various KOH percentages allowed us to obtain mixtures of Ba5Nb4O15.33 with Nb12O29 or Ba5Nb4O15.48 with K0.8Ba0.2NbO3.
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